| 摘要 |
PURPOSE:To prevent the arm at AC conversion time due to the inverter of a modulation puls from shortcircuiting by providing correcting means inserted through marginal time when the first and second modulation pulses are switched. CONSTITUTION:In a controller 10, a timer (a) receives a timer interrupt whenever a clock O contained in a microcomputer is input, and outputs timer counting data D1. A CPU and a memory (b) have functions for storing necessary control calculation and necessary data to drive an AC motor 30. An i/o port C controls ON or OFF so that both are not simultaneously turned ON (the arms is shortcircuited) by considering the marginal times for a PWM control signal 3 for a power switch element S1 and the SWM control signal 4 of a power switch element S2. |
